Help guides
Boiler and heating help guides
Common boiler and heating faults explained: what is likely to be wrong, the checks that are safe to do yourself, and when to call a Gas Safe engineer. No jargon and no DIY gas work.
All help guides
Boiler losing pressure?
Why your boiler keeps losing pressure, how to safely top it back up to 1 to 1.5 bar, and when a pressure drop means a leak that needs a Gas Safe engineer.
Read the guideNo hot water?
No hot water but the heating works, or neither? The checks worth doing before you call anyone, and the faults that need a Gas Safe engineer to fix.
Read the guideRadiators cold at the bottom, or the top?
Cold at the top means air and you can bleed it yourself. Cold at the bottom means sludge, and that needs a proper flush. How to tell which you have.
Read the guideBoiler making banging, gurgling or whistling noises?
Kettling, banging, gurgling or whistling from your boiler: what each noise usually means, what's safe to check, and when to get a Gas Safe engineer in.
Read the guideBoiler leaking water?
A leaking boiler wants attention the same day. What to switch off, what the leak usually is, and why you shouldn't run a boiler that's dripping.
Read the guideBoiler stopped in cold weather? Check the condensate pipe
Boiler locked out in freezing weather with a gurgle and a fault code? The outside condensate pipe is probably frozen. How to thaw it safely and stop it recurring.
Read the guideVaillant fault codes explained
What Vaillant fault codes F22, F23, F24, F27, F28, F29, F54 and F75 mean, which ones you can safely sort yourself, and when to call a Gas Safe engineer.
Read the guide
Smell gas? Don’t troubleshoot. Call the National Gas Emergency line free on 0800 111 999 first.
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